本文从四个“点”着手对《透视空间》的某些见解进行论述，提出作者不同的学术见解。
The essay discusses some ideas in Perspective Space from four points, and expresses the author's different views.
因此，考古学、DNA及大量的学术见解都极明确地告诉大家，最早不过一万五千年前，人类从东北亚抵达了北美洲。
So archaeology, DNA, and the bulk of academic opinion, are telling us effectively that everybody in America arrived from north-east Asia less than 15, 000 years ago.
长期以来，管井过滤器直径和长度确定一直是管井工程未完全解决的理论和实践课题，迄今，有关规定不同，存在学术见解分歧，也存在诸多值得讨论的问题。
The determination of diameter and length of tube well filter is always a problem not being completely solved for a long time in tube well engineering from theoretical and practical point of view.
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